📚 Muon, noun. 🔉 /ˈmjuːɒn/ 🇬🇧 ❓ Definition (Physics): An unstable subatomic particle of the same class as an electron (a lepton), but with a mass around 200 times greater. Muons make up much of the cosmic radiation reaching the earth's surface. ❗️ Examples: 1. The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons. 2. These objects also produce high-energy massive particles such as electrons, muons, protons and anti-protons. 3. Comsic rays are very high energy particles which strike the Earth's atmosphere and produce spectacular showers of billions of electrons, muons, and other particles. 4. The number of times that an antimuon emits a positron in the same direction as its polarization was found to be equal to the number of times that a muon emits an electron in the opposite direction. ━━━━━━━━━━━━━ 🌀 @cambridge_dic